Yeah, scifi/fantasy writers that make it are few and far between. It's a reason I'm considering leaving Independence, MO. Too much competition (okay, that's not the reason). Seriously, you have to work darn hard if you want to make it. You have to take it as seriously, or even more so, than your full time job. You have to learn what the market is, how to do it, what's expected, yadda, yadda, yadda. If you're willing to make it a passion, and you're smart enough, and talented enough, you might make it.
I think it might be a paradox. You have to put your life, heart, and soul into your work, but you also have to be able to shake off rejection and disappointment and you can't take yourself too seriously. Sounds fun.
Matt